//
// PluginGain.c - MrsWatson
// Copyright (c) 2016 Teragon Audio. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//

#include "PluginGain.h"

#include "audio/SampleBuffer.h"
#include "logging/EventLogger.h"

const char *kInternalPluginGainName = INTERNAL_PLUGIN_PREFIX "gain";

static void _pluginGainEmpty(void *pluginPtr) {
  // Nothing to do here
}

static boolByte _pluginGainOpen(void *pluginPtr) { return true; }

static void _pluginGainDisplayInfo(void *pluginPtr) {
  logInfo("Information for Internal plugin '%s'", kInternalPluginGainName);
  logInfo("Type: effect, parameters: none");
  logInfo("Description: a basic gain effect");
}

static int _pluginGainGetSetting(void *pluginPtr, PluginSetting pluginSetting) {
  switch (pluginSetting) {
  case PLUGIN_SETTING_TAIL_TIME_IN_MS:
    return 0;

  case PLUGIN_NUM_INPUTS:
    return 2;

  case PLUGIN_NUM_OUTPUTS:
    return 2;

  default:
    return 0;
  }
}

static void _pluginGainProcessAudio(void *pluginPtr, SampleBuffer inputs,
                                    SampleBuffer outputs) {
  Plugin plugin = (Plugin)pluginPtr;
  PluginGainSettings settings = (PluginGainSettings)plugin->extraData;
  unsigned long channel, sample;

  sampleBufferCopyAndMapChannels(outputs, inputs);

  for (channel = 0; channel < outputs->numChannels; ++channel) {
    for (sample = 0; sample < outputs->blocksize; ++sample) {
      outputs->samples[channel][sample] *= settings->gain;
    }
  }
}

static void _pluginGainProcessMidiEvents(void *pluginPtr,
                                         LinkedList midiEvents) {
  // Nothing to do here
}

static boolByte _pluginGainSetParameter(void *pluginPtr, unsigned int i,
                                        float value) {
  Plugin plugin = (Plugin)pluginPtr;
  PluginGainSettings settings = (PluginGainSettings)plugin->extraData;

  switch (i) {
  case PLUGIN_GAIN_SETTINGS_GAIN:
    settings->gain = value;
    return true;

  default:
    logError("Attempt to set invalid parameter %d on internal gain plugin", i);
    return false;
  }
}

Plugin newPluginGain(const CharString pluginName) {
  Plugin plugin = _newPlugin(PLUGIN_TYPE_INTERNAL, PLUGIN_TYPE_EFFECT);
  PluginGainSettings settings =
      (PluginGainSettings)malloc(sizeof(PluginGainSettingsMembers));

  charStringCopy(plugin->pluginName, pluginName);
  charStringCopyCString(plugin->pluginLocation, "Internal");

  plugin->openPlugin = _pluginGainOpen;
  plugin->displayInfo = _pluginGainDisplayInfo;
  plugin->getSetting = _pluginGainGetSetting;
  plugin->prepareForProcessing = _pluginGainEmpty;
  plugin->showEditor = _pluginGainEmpty;
  plugin->processAudio = _pluginGainProcessAudio;
  plugin->processMidiEvents = _pluginGainProcessMidiEvents;
  plugin->setParameter = _pluginGainSetParameter;
  plugin->closePlugin = _pluginGainEmpty;
  plugin->freePluginData = _pluginGainEmpty;

  settings->gain = 1.0f;
  plugin->extraData = settings;
  return plugin;
}
